How can I treat vertebro basilar artery insufficiency?

Meds, reduce risks. This is generally from narrowing/blockage of the arteries to the back of the brain. Symptoms of this can vary, but often include dizziness, difficulty using an arm, loss of sensation of face/arm/leg. It is treated with antiplatelet medications (eg. Aspirin, plavix, (clopidogrel) aggrenox), controlling cholesterol, blood pressure, diabetes, cessation of tobacco use, and in some cases placing a stent.
See below. Usually it is from atherosclerosis, then control of hypertension, lipid abnormality, stop smoking, diabetes, obesity, cardiac control anti platelet agents etc. Follow your doctor.